Many people believe we will face environmental disasters ________

Many people believe we will face environmental disasters _________ we completely change the way we live.

#57124

but

though

unless

until

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We just need one of you for the game.youyour brother can join us.

#56734

Both； and

Neither；nor

Either；or

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In the street I met the professor_______gave us a talk last week.

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what

which

／

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Hold on to your dreams, _____ they will come true some day.

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but

and

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She was ill,         she still went to work and tried her best to do the work.

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though

because

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― Let me help you carry the box.― No, thanks. It’s big, ________ there is nothing in it.

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and

but

because

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